<!-- 采用html5  -->
<!DOCTYPE html>
<html>

  <head>
      

    <meta charset="UTF-8">

    <!-- 页面显示适应移动设备 -->
    <meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no" >

    <title>我的APP</title>
    


  </head>  


  <body>
    <div style="margin-bottom:90px;width:50px;height:50px;background-color: red;">


    </div>
    <div style="width:150px;height:150px;background-color: red;position: relative;top:20px;">
        <div style="left:20px;top:10px;width:50px;height:50px;background-color: yellow;position:absolute;"></div>

    </div>
    
  </body>

 


</html>
